A bronze mirror I found about 40 years ago in a weapon box in my family's earthen storehouse. It's at least a copper product and conducts electricity when tested. It has a ◇ symbol indicating north, south, east, and west on four sides, and 12 characters that appear to be ancient writing. I haven't had its authenticity assessed. The surface has been polished. Diameter: 8cm, Weight: 117g It comes with a wooden box, which I recently adjusted. For display purposes.